Noah makes ceramic pots for the market. on the weekends he makes 11 more pots than he does during the week. noah represented the number of pots he makes on weekends using the expression p + 11. which expression represents the total mumber of pots noah made one weekend if he made 14 more than his usual number?

For this case what you should do is use the given expression and add 14.
 We have then:
 Original function:
 f (p) = p + 11.
 New function:
 g (p) = f (p) +14
 Substituting we have:
 g (p) = (p + 11) +14
 g (p) = p + 25
 
 An expression that represents the total mumber of pots Noah made one weekend if he made 14 more than his usual number is:
 g (p) = p + 25

No a triangle cannot be formed because when you add the two smallest number together (which would be 11) the have to be bigger than the number it is "against" ( which would be 12)